Monarch caterpillar found on road pupated the next day, hatched September 15.
In the 3rd shot (4202) you can see the chrysalis starting to open. This was an automated photo (the camera had been clicking away every ten minutes all night).
Regret I wasn't there (or snapping at a shorter interval) at the moment when it popped out, but I caught it a few minutes later (4204). We took it outside in the early afternoon and it spent further time acclimating after a short flight to a tree.